<template>
	<view>
		<view class="search-box">
			<uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons> 
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="23" @click="clean"></uni-icons>
			</view>
			<!-- 列表区 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器
				timer : null,
				kw: '',
				// 搜索结果列表
				searchResults:[],
				// 历史数据
				historyList:[],
				
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			// input的事件处理函数e用户输入的值
			input(e){
				//防抖延时器
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					this.kw = e
					// 根据关键词，查询建议列表
					this.getSearchList()
				},500)
			},
			
			// 搜索建议列表
			async getSearchList(){
				// 1.判断关键词是否为空
				if(this.kw.length === ''){
					this.searchResults = []
					return
				}
				// 发起请求
				const {data : res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status !==200)return uni.$showMsg()
				this.searchResults = res.message
				
				this.saveSearchHistory()
			},
			
			// 
			gotoDetail(item){
				console.log(item.goods_id);
				uni.navigateTo({
					url:"/subpkg/goods_detail/goods_detail?goods_id" +item.goods_id
				})
			},
			// 保存的搜索关键词
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				// 去重
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				
				this.historyList = Array.from(set)
				// 持久化数据存储到本地
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			// 清除历史记录
			clean(){
				this.historyList = [],
				uni.setStorageSync('kw','[]')
			},
			
			// 去商品列表页面
			gotoGoodsList(kw){
				uni.navigateTo({
					url:"/subpkg/goods_list/goods_list?query=" + kw
				})
			}
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
.search-box{
	// 吸顶
	position: sticky;
	top: 0;
	z-index: 999;
}

.sugg-list{
	padding: 0 5px;
	
	.sugg-item{
		font-size: 12px;
		padding: 13px 0 ;
		border-bottom: 1px solid #efefef;
		display: flex;
		align-items: center;
		justify-content: space-between;
		
		.goods-name{
			// 不换行
			white-space: nowrap;
			// 溢出隐藏
			overflow: hidden;
			// ...代替
			text-overflow: ellipsis;
			margin-right: 3px;
		}
	}
	
}

.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 15px;
		border-bottom: 1px solid #efefef;
	}
	
	.history-list{
		display: flex;
		flex-wrap: wrap;
		
		.uni-tag{
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}

</style>
